CVE-2026-20476 in MT6813
Summary
by MITRE • 08/03/2026
In ccci, there is a possible out of bounds read due to a missing bounds check. This could lead to local denial of service with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS10981532; Issue ID: MSV-7660.
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Analysis
by VulDB Data Team • 08/03/2026
The vulnerability in question represents a critical out-of-bounds read condition within the ccci component, which operates as a core communication interface in mobile device systems. This flaw stems from an inadequate bounds checking mechanism that fails to validate data access boundaries before processing incoming information. The missing validation creates a scenario where maliciously crafted input can cause the system to read memory locations beyond the allocated buffer space, potentially exposing sensitive data or causing system instability.
The technical implementation of this vulnerability manifests when the ccci module processes user-supplied data without proper boundary verification. This type of flaw falls under the CWE-129 weakness category, specifically addressing insufficient bound checking in array access operations. The absence of input validation allows attackers to manipulate memory access patterns through carefully constructed payloads that exceed expected buffer limits. When executed, this condition can trigger memory corruption or unauthorized data exposure, depending on the specific memory locations accessed during the out-of-bounds read operation.
From an operational perspective, this vulnerability presents a significant risk for local denial of service attacks, requiring only user execution privileges to exploit successfully. The lack of user interaction requirements makes this flaw particularly dangerous as it can be triggered automatically without any conscious action from the end-user. Attackers can leverage this condition to disrupt normal system operations, potentially causing application crashes or complete system instability. The vulnerability's impact extends beyond simple service disruption since memory exposure could lead to information disclosure, making it a multi-faceted threat vector.
The patch identifier ALPS10981532 and issue reference MSV-7660 indicate this was addressed through specific firmware updates targeting the ccci module. Organizations should prioritize immediate deployment of these patches to mitigate the risk of exploitation. The remediation approach involves implementing proper bounds checking mechanisms that validate all input data against predetermined buffer limits before processing occurs. Security teams should also consider monitoring for anomalous memory access patterns that might indicate attempted exploitation of this vulnerability, as outlined in the attack pattern categories within the ATT&CK framework for privilege escalation and denial of service techniques.
This vulnerability demonstrates the critical importance of robust input validation in system components that handle external data processing. The flaw represents a classic example of how insufficient boundary checking can create exploitable conditions in communication interfaces, highlighting the need for comprehensive security testing during development phases and regular vulnerability assessments throughout the software lifecycle.